21321111022213 has 4 divisors (see below), whose sum is σ = 21324365663328. Its totient is φ = 21317856381100.

The previous prime is 21321111022121. The next prime is 21321111022217. The reversal of 21321111022213 is 31222011112312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21321111022213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321111022217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1627310731 + ... + 1627323832.

It is an arithmetic number, because the mean of its divisors is an integer number (5331091415832).

Almost surely, 2^{21321111022213} is an apocalyptic number.

It is an amenable number.

21321111022213 is a deficient number, since it is larger than the sum of its proper divisors (3254641115).

21321111022213 is an equidigital number, since it uses as much as digits as its factorization.

21321111022213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3254641114.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21321111022213 its reverse (31222011112312), we get a palindrome (52543122134525).

Subtracting 21321111022213 from its reverse (31222011112312), we obtain a palindrome (9900900090099).

The spelling of 21321111022213 in words is "twenty-one trillion, three hundred twenty-one billion, one hundred eleven million, twenty-two thousand, two hundred thirteen".